What carb is this? What are my options?

What exactly are the bolt differences on the intake on a 64/65 273 engine and a newer 273? I need to figure out which one I have. How do I tell?

See if you can use a 1/2" wrench/socket on the bolts,
if so its the 1964/65 intake.

Cavemanmoron - That's a great sounding combination you have. What, exactly, do you have; engine, cam, exhaust?
Thanks1
C

Thanks for the kind words,
1973 era 318 rebuilt, stock bore, the previous engine owner was kind
to the engine, no sludge, had the block hot tanked, machine honed,
new cam bearings installed at the machine shop, crank polished.

I reassembled the engine, put in a New Mellings oil pump, Not high volume,
or high pressure. Heavy duty oil pump bushing too.

Cam is a Mopar Performance .430/.450 lift
DCC-4452759 Basic Operating RPM Range: 1,200-5,200

# 302 casting heads

Dual exhaust off the stock 1964-66 273 Abody exhaust manifolds,
they start at the stock size and are opened up to 2 1/4".

Dynomax Super Turbo mufflers
1969 340 Dart chrome tips.

I am using an Edelbrock LD4B intake, that intake was made for the 318
small sized ports, and keeps the air/fuel mixture velocity higher,
than using a large port 340 intake can.

I am using an Edelbrock # 1406 AFB replacment carb that is rated 600cfm,
a 500 cfm might be a little better, but this works fine for me.

What a joy to work on a car that was in California for almost 40 years,
before it came East.